Java打包下载ZIP压缩文件

/**
*java打包下载ZIP压缩文件
*/
public void downZipFile() { 
        try {
            request.setCharacterEncoding("UTF-8");  
            response.setContentType("application/x-compress;charset=UTF-8");
            response.setHeader("Content-disposition", "attachment; filename=" + this.getZipFilename());    
            String url = this.request.getParameter("url");
            if(url != null && !url.trim().equals("")){
                //url = new String(url.getBytes("iso-8859-1"),"UTF-8");
                String[] urls = url.split(",");
                ZipOutputStream zos = new ZipOutputStream(response.getOutputStream()); 
                String tomcat = request.getSession().getServletContext().getRealPath("/");
                File[] files = new File[urls.length];   
                for (int i = 0; i < files.length; i++){
                    files[i] = new File(tomcat+urls[i]);
                } 
                zipFile(files, "", zos);  
                zos.flush();      
                zos.close();
            }
         } catch (IOException e) {
            e.printStackTrace();
         }    
    }